Tetraethylene

Fig. 1. Vapor pressures of glycols at various temperatures. A, ethylene glycol B, diethylene glycol C, triethylene glycol and D, tetraethylene glycol.

Property Ethylene glycol Dieth ene glycol Triethylene glycol Tetraethylene glycol... 

Tetraethylene glycol may be used direcdy as a plasticizer or modified by esterification with fatty acids to produce plasticizers (qv). Tetraethylene glycol is used directly to plasticize separation membranes, such as siHcone mbber, poly(vinyl acetate), and ceUulose triacetate. Ceramic materials utilize tetraethylene glycol as plasticizing agents in resistant refractory plastics and molded ceramics. It is also employed to improve the physical properties of cyanoacrylate and polyacrylonitrile adhesives, and is chemically modified to form polyisocyanate, polymethacrylate, and to contain siHcone compounds used for adhesives. 

Tetraethylene Glycol Brochure F-80066-ICD, Union Carbide Chemicals and Plastics Co. Inc., Danbury, Conn., 1990. 

Cy—oxo-derived acids are the principal derivatives of the C —oxo aldehydes, and ia analogy to oxo aldehyde market appHcations, are used chiedy to make neopolyol esters, ie, those based on neopentyl glycol, trimethylolpropane, or pentaerythritol. These synlubes are employed almost entirely ia aeromotive appHcations. Heptanoic acid is also employed to make tetraethylene glycol diheptanoate, a plasticizer used with poly(vinyl butyral). 

Many organic reagents have been used successfully in Pu separation processes. The reagents include tri- -butyl phosphate (TBP) methyl isobutyl ketone thenoyl ttifluoroacetone (TTA) ethers, eg, diethyl ether, di- -butyl ether, tetraethylene glycol dibutyl ether trdaurylamine (TT,A) trioctylamine (TOA) di- -butyl phosphate (DBP) hexyl-di(2-ethylhexyl) phosphate (HDEHP) and many others. Of these, TBP is by far the most widely used (30,95). 

The DADC monomer has been copolymerized with small amounts of polyfunctional methacryflc or acryflc monomers. For example, 3% triethylene glycol dimethacrylate was used as a flexibiflzing, cross-linking agent with a percarbonate as initiator (26). CR-39 and diethylene glycol diacrylate containing isopropyl percarbonate were irradiated with a mercury lamp to a 92% conversion and then cured at 150°C (27). By a similar two-step process DADC was copolymerized with methyl methacrylate and tetraethylene glycol dimethacrylate (28). 

LB Films of Polymeric Amphiphile. Since the first successful deposition of a polymeric LB film (61), there have been a large number of studies examining different stmctural parameters on the transferabiHty and stabiHty of the polymeric LB films (4). One interesting idea for polymers for LB films is the use of a spacer group (mosdy hydrophilic) to decouple the motion of the polymer from that of the Hpid membrane (62,63). Monolayers from a poljmier (10) having hydrophilic phosphate groups and a tetraethylene oxide spacer were used to link a glycerol diether to the polymer chain (63). 

The addition of an a-hydroxycarboxyhc acid to a tetraethylene, propylene, diethjiene, or hexylene glycol titanate gives water-soluble complexes suitable for gelling aqueous solutions of hydroxyl polymers, such as poly(vinyl alcohol) (PVA), or cellulose (qv) derivatives. These are useful as binding agents for glass fibers, clays (qv), and paper coatings (85). 

PVB resins are also compatible with a limited number of plasticizers and resins. Plasticizers (qv) improve processibility, lower T, and increase flexibihty and resiUency over a broad temperature range. Usehil plasticizers include dibutyl and butyl benzyl phthalates, tricresyl and 2-ethylhexyl diphenyl phosphates, butyl ricinoleate, dibutyl sebacate, dihexyl adipate, triethylene glycol di-2-ethylbutyrate, tetraethylene glycol diheptanoate, castor oil, and others (64-73). 

Union Carbide Tetra Process tetraethylene glycol [112-60-7] 29... 

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